Double-acting steam and like pump



Jan. 17, 1 28. 1,656,362

. J. E. L. OGDEN DOUBLE AC TING STEAM AND LIKE PUMP Filed May 10. 1926 2 Sheets-Sheet 1 Jan. 17, 1928. 1,656,362

J. E. L. OGDEN DOUBLE ACTING STEAM AND LIKE PUMP Filed May 10. 1926 2 Sheets-Sheet 2 Patented Jan. 17, 1928.

UNITED T TES PATENT OFFICE.

.rcnn nnwann tnwrs OGDEN, or LISGARD, ENGLAND.

nounnnacrrne STEAM m) LIKE PUMP.

Applicatio a ua i o, 1920, Serial no. 108,154, and in G-reat Britain October 14, 1925,

This invention'refers to' a new orfiimg proved construction of doubleactin'g steam or like pump, which in addition to other advantages arising from its construction,

speciallysuitable for pumping hot or boiling liquids. In its application a pump for hot or boiling liquids its chief use will bein connection with boiler feed: vpumps for returning water of condensation to the steam boiler against boilerpressure, and in such connection the steam used in operating the pump may also serv'eto augment the heat of the feed water. Y i

According' to the invention, the pump com prisesa cylinderclosed at eache d by a cylinder head and having a fixe central partition dividing the cylinder into two chambers, a piston in each chamber, a connecting rod passing through the saidparti tion coupling: the two pistons together,inlet and outlet valves for each chamberedjacent to the partition and inlet and outlet valves for each chamber adjacent to :the cylinder heads. The invention further comprises ports in the cylinders to becovered and uncovered by the pistons. for controlline" the valves for the steam or other fluid used for operating thepump, and where the pump is tobe used as a steam pump for boiler feed water purposes, the steam being admitted adjacent to the cylinder heads. further ports are provided in the cylinder.

controlled by the pistons and connected for the transfer of the used steam at orjnealr the end of each stroke tdthe-pump chamber charged by such stroke. Thetransference of the steam in this manner serves the dual purpose of completing the stroke and of. employing the heat inthe steam to heat the feed water. A further feature of the invention consists in arranging the pump outlet at the upper part of the cvlinderso that air or vapours are expelled first, striving quickpriminpr and other advantages in operation. a i

The accompanying 1 drawings illustrate one; form of feed watenpump made in accordance with this invention in which Fig. -1- is a longitudinal sectional. elevation. Fig. 2 is a crosssectional elevation on line 2, 2. Fig.1. j a

Fig. 3 is an external elevation of the Fig. 4 isa'sectionaldetail view of the pistons.

.As shown, the cylinder a forming the body d" (not shown) at one side, and feed water outlet ports a e" at thetop. .Non-return mushroom valves (Z and a? (not shown) and c and ot' the usual type are provided. The cylinder ais provided with cylinder heads 7 f and with a central partition g dividing the cylinder into two chambers, having their inlet port d, d" and an outlet port e, 6 adjacent to the partition. The partition 9 is formed with bosses g g and is bored centrally through the bosses. The cylinder a is provided with liners a a to facilitate construction, as for instance in the formation of ports, which will be referred to hereafter. and for easy replacement; Pistons h, h formed with a comparatively long skirt, are provided, one in each chamber of the cylinder, thepistons being; connected together by a rod 7 enclosed by a sleeve 72 which latter is a sliding fit in the bore of the partition 9 and bosses g g.

The central portion of the cylindrical valve chamber 7) is separated from the cylinand 7 connected by a rod 7' to which they .are each secured by gudgeon pin 7' 7'*. Each piston is formed with a waist 7' 7' which provides the passage for the exhaust steam. End-covers k k are provided for the valve chamber through which pass rods 7" j secured in the heads of pistons j and 'ion the end of which rods are arranged. rubber buffers m m with adjusting nuts m m, the bufiers coactinp with suitable bosses I0 7 formed on the covers k, k. For operating the piston valve, ports a, n are formed in the cylinder at so as to be uncoveredbythe pistons h, h when at the-inner ends of their strokes, such ports being connected by suitable piping W, n to the outer ends of the piston-valve chamber 6. The main steaminoutlet 0 are provided below the valve chamber. Bye-pass passages 0", 0* are cut in the valve chamber sleeves to allow the steam behind the valve pistons j and j to leak to the exhaust passage 0 at the end of its stroke.

F or heating the feed water by means of the exhaust steam, ports 11, p are provided in the cylinder a, to be uncovered by the istons h, 72 at the inner end of their stroke nitable piping 2 p" and control valves p, p are provided to connect these ports to the pump chamber of the opposite piston.

WVhere the pump is for pumping cold liquids it desirable to check heat conduction, both to preventheating of the liquid. and condensation of the steam, and therefore the piston heads may be jacketed as shown at in Fig. 4, and such jacket may be an air pocket, or may be filledwith water, oil, asbestos, or any substance of low conductivity. In Fig. 4, the sleeve 71 is dispensed with and the rod 7L2 slides directly in the bosses of the partition g, this enabling a greater output to be obtained at a lower pressure, by reducing the differential area of the pistons.

In operation, assuming the pistons h, k and piston valves j, j to be in the positions shown in Fig. l, the steam entering the valve chamber 7) by the inlet 0 passes up the passage b uncovered by the valve j into the cylinder at. The piston h is therefore caused to move to the right and in so doing reduces the spaces between it and the partition g,

causing the fluid therein to be forced out through the valve 6 At the same time the piston it moves by reason of the connecting rod l1 and in so doing draws in liquid through the valve (i (not shown) into the pump space between the piston and the partit-ion 9 while the steam space above the pistou h is open to exhaust through the passage 6 round the waist j of the piston valve to the exhaust passage 0 and steam outlet 0 As the left hand piston 71 nears the end of its stroke it uncovers the port n in the cylinder and steam is admitted from the cylinder a directly to the head of the piston valve j'forcing it across to the right. This movement of the piston valve opens the steam space above the piston h to exhaust and admits steam to the head of the piston 72- and the return motion of the pistons 11, 71 takes place, at the end of which movement the port a is opened,admitting steam to the head of the piston valve j, and returning it to the position illustrated, thus completing the cycle of operations.

When the ports 19, p are open, thesteain in the cylinder (which at the end of the stroke is still at a considerable pressure) is admitted to the pump chamber of the opposite piston through the piping p 19 and valves 1), p. Such transfer of steam has the effect of assisting the pistons h, h to complete the stroke by introducing a pres sure in the pump space, and also the heat in the steam is used to heat the contents of the pump.

The construction and arrangement of the parts of the pump give many advantages as, for instance, in providing a high output for the size and weight of the machine, in the elimination of glands and packings and the balancing efiect of the pressures at the pistons avoiding the necessity of piston rings, in the lightness of moving parts which assist in speeding up to give increased output, and in the arrangement of the pump valves which provide for expulsion of the gases first, and hence quick priming of the pump, and the ability to deal with hot or boiling liquids.

What I claim is 1- 1. A double-acting steam or like fluid pump comprising two cylinders arranged end to end, a partition separating the cylinders, a piston in each cylinder, a connecting rod I joining the pistons and passing through the partition, valve controlled steam inlet and outlet means in the outer or power ends of the cylinders, valve controlled fluid inlet and outlet means in the inner or pump ends of the cylinders, a steam port in the wall of each cylinder adapted to be covered by the piston and to be uncovered thereby at the inner end of its stroke, as by a piston valve, for the passage and employment of exhaust steam from the cylinders, and valve operating means for the steam valves controlled by the movements of the pistons, as set forth.

2. A double-acting steam or like fluid pump comprising two cylinders arranged end to end, a partition separating the cylinders, a piston in each cylinder, a connecting rod joining the pistons and passing through the partition, valve controlled.

steam inlet and outlet means in the outer or power ends of the cylinders, valve controlled fluid inlet and outlet means'in the inner or pump ends of the cylinders, a steam port in the wall of each cylinder adapted to be covered by the piston and to be uncovered thereby at the inner end of its stroke, as by a piston valve, valve controlled transfer passages from each such port to the pump end of the opposite cylinder, for the utilization of the exhaust steam in the cylinders and valve operating means for the steam valves mntrolled by the movements of the pistons, as setforth.

3. A double-acting steam or like fluid pump comprising two cylinders arranged end to end, a partition separating the cylinders, a piston in each cylinder, a connecting rod joining the pistons and passing through the partition, steam inlet and outlet means in the outer or power ends of the cylinders, a piston valve controllin such inlet and outlet means, valve contro led fluid inlet and outlet means in the inner or pump end of the cylinders, a steam port in the wall of each cylinder adapted to be covered by the piston and to be uncovered thereby at the inner end of its stroke, and passages operably connecting such ports to the piston valve for the passage of exhaust steam from'the cylinders to operate the said piston valve, as set forth;

4. A double-acting steam or like fluid pump comprising two cylinders arranged end to end, a partition separating the cylinders, a piston in each cylinder, a connecting rod joining the pistons and passing through the partition, steam inlet and outlet means in the outer or power ends of the cylinders, a piston valve controlling such inlet and out let means, valve controlled fluid inlet and outlet means in the inner or pump end of the cylinders, ports in the walls of the cylinders adapted to be covered by the pistons and to be uncovered thereby at the inner end of their stroke, passages opera/bl connecting such ports to the piston valve or the passage of exhaust steam from the cylinders to operate the said piston valve, and valve controlled transfer passages from such ports to the pump end of the opposite cylinder for the utilization of the exhaust steam in the cylinders, as set forth. 1

end to end, a partition separating the cylinders, a piston in each cylinder, a connecting rod joining the pistons and passing through the partition, valve controlled steam inlet and outlet means in the outer or power ends of the cylinders, valve controlled fluid inlet and outlet means in the inner or pump ends of the cylinders, a steam port in the wall of each cylinder adapted to be covered by the piston and to uncover thereby at the inner end of its stroke, as by a piston valve, for, the passage and employment of exhaust steam from the cylinders, valve operating means for the steam valves controlled b the movements of the pistons; pistons having a body or skirt, and a boss on each side of the partition over which the body or skirt of the piston fits when at the innerend of its stroke so as to leave a relatively small compression space, as set forth.

7 A double-acting steam or like pump comprising two cylinders arranged end to end, a partition separating the cylinders formed with a central projecting boss on each side, a piston in each cylinder having a body or skirt longer than the stroke of the piston and adapted to fit over the boss when at the inner end of its stroke, a connecting rod joining the two pistons, a sleeve surrounding the connectin rod and passing through the partition an bosses, steam inlet and outlet ports at the lower and outer ends of each cylinder, a steam operated piston valve controlling such ports, valve-controlled pump inlet and outlet ports at the inner ends of the cylinders adjacent to the partition,

.the outlet ports being arranged in the upper portion ofthe cvlinder, two further 'orts in the wall of eac cylinder opening into the steam or power end thereof and with which the body or skirt of the piston acts to constitute a piston-valve, a valve-controlled transfer passage from one such further port in each cylinder leading to the pump end of the opposite cylinder and means connecting the other of such further ports to the piston valve for o crating the valve, as set forth.

8. In a ouble-acting steam or like pump accordingto claim 7, in combination a piston jacketed with a heat non-conducting material, as set forth.

In testimony whereof I have signed my name to this specification.

J OHN EDWARD LEWIS OGDEN. 

